/*
 * Copyright (c) 2011 Imre Fazekas.
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the Brillien nor the names of its
 * terms and concepts may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package com.vii.streamline.jsonrpc.exchange;

import com.vii.streamline.json.JsonRpcListener;
import com.vii.streamline.jsonrpc.JsonRpcDispatcherServlet;
import com.vii.streamline.services.error.StreamLineException;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;

/**
 * Specialized {@DispatcherServlet} dealing with transport messages over JSON-RPC.
 */
public class ExchangeServlet extends JsonRpcDispatcherServlet {

    protected static ExchangeServlet                servletInstance;

    protected ExchangeDataProvider                  dataProvider;
    protected long                                  expirationTime;

    static{
        servletInstance = new ExchangeServlet();
    }

    public static ExchangeServlet getServletInstance() {
        return servletInstance;
    }


    protected ExchangeDataProvider getDataProvider(ServletConfig config) throws StreamLineException {
        return null;
    }

    @Override
    protected JsonRpcListener getJsonRpcListener() throws ServletException {
        if( listener == null ){
            listener = new ExchangeJsonRpcListener(
                    ssoRequired,
                    dataProvider, expirationTime,
                    logger
            );
        }
        return listener;
    }

    @Override
    public void init() throws ServletException {
        super.init();

        getJsonRpcListener( );
    }

    @Override
    public void destroy() {
        if( dataProvider != null ){
            try {
                dataProvider.close();
            } catch (StreamLineException e) {
                logger.error("Failed to close the dataprovider!", e);
            }
        }

    }

}
